of state john kerry is visiting for the first time. it will be a tense week ahead there. of course, we all remember the image of former president hosni mubarak behind a cage in that courtroom, being tried for allowing protesters in tahrir square to die. well, tomorrow, the next president who followed him, mohamed morsi, slated to be in court, as well. his trial set to begin. abc's alex marquardt in cairo tonight, watching it all. alex? >> reporter: good evening, david. egypt is on edge tonight, bracing for possibly more violence as the trial of mohamed morsi starts in just a few hours. the muslim brotherhood, which morsi belongs to, has called for massive nationwide protests, which in the past have triggered violent clashes with the security forces. morsi hasn't been seen since he was ousted by the military on july 3rd after millions of egyptians poured into the streets, demanding he step down. he's also been held at a secret location. and as the anxiety here rises, secretary of state john kerry visited cairo today to try to smooth over relations which are at their lowest point in decades.